In this workshop we propose to discuss the pros and cons of using commercial social networks vs internal contained social network functionalities within a MOOC platform. We will examine different ways of using social networks functionalities “inside-outside” a sMOOC platform, based on practices carried out by the sMOOC pilots of the European project ECO and their evolution through several iterations. Furthermore, we will look at how ECO pedagogical teams use commercial and noncommercial social networks in order to reach the goals of the European project (enrolment, motivation, community management, e-teacher projects…). Participants are invited to share, compare, and comment on their own practices and ideas, as well as to join the conversation around such questions as: how to keep the potential of social networks while building learning and educational competences? What is the right balance between commercial and non-commercial uses in sMOOC pedagogical design? Are social networks valid tools that contribute to constructivist forms of knowledge? What new learning strategies can emerge from such network effects?